CN110319953A - A kind of cable conductor temperature forecasting system, method, apparatus and readable storage medium storing program for executing - Google Patents
A kind of cable conductor temperature forecasting system, method, apparatus and readable storage medium storing program for executing Download PDFInfo
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Abstract
This application discloses a kind of cable conductor temperature forecasting system, method, apparatus and computer readable storage mediums, it include: sheath temperature computing module, for obtaining the historical measurement data of cable, using the cable Analysis of Transient Thermal Field differential equation, the protective metal shell temperature of cable is obtained；Thermal resistance thermal capacitance computing module obtains including that the thermal resistance of external environment and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance using thermal resistance thermal capacitance ordered series of numbers obtain the thermal resistance and thermal capacitance of external environment for utilizing external thermal resistance thermal capacitance calculation formula and protective metal shell temperature；Conductor temperature prediction module obtains the temperature prediction value of the conductor of cable for the thermal resistance and thermal capacitance and the cable Analysis of Transient Thermal Field differential equation using external environment；Historical measurement data of the application based on cable, extrapolate the thermal resistance and thermal capacitance of subsequent time external environment, it solves the problems, such as the unknown prediction for leading to not prediction, realizing to cable conductor temperature of external environment, increases cable power transmission capacity for dynamic and power scheduling provides reference frame.
Description
Technical field
The present invention relates to power cable state monitor field, in particular to a kind of cable conductor temperature forecasting system, method,
Device and computer readable storage medium.
Background technique
Currently, due to China's rapid economic development, for the construction of city high voltage electric transmission cable be in one it is faster on
Lifting speed.This solves the problems, such as that urban aerial route is inaesthetic to a certain extent, while also bringing high voltage electric transmission cable
The problem of various complexity in operation and maintenance.High voltage electric transmission cable is mainly using crosslinked polyethylene as insulating materials, current-carrying
Amount is to allow maximum operating temperature to be determined for a long time with insulating materials.Insulating materials operating temperature is conductor in actual motion
Hull-skin temperature, the excessively high Acceptable life that can reduce cable of conductor temperature；Temperature is too low and cable is made to be chronically at low load
State prevents cable from being utilized effectively.
Therefore, how Accurate Determining even predicts each layer temperature of cable in operation, just becomes and calculates the practical current-carrying capacity of cable
Premise and basis.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of cable conductor temperature forecasting system, method, apparatus and calculating
Machine readable storage medium storing program for executing realizes the cable conductor temperature prediction in subsequent time period, increases cable power transmission capacity for dynamic, most
Power scheduling when limits improve cable utilization efficiency and power grid summer peak meeting heavy load period or emergency service provides ginseng
Examine foundation.Its concrete scheme is as follows:
A kind of cable conductor temperature forecasting system, comprising:
Sheath temperature computing module, for obtaining the history oversheath temperature, ambient boundary temperature and each layer of cable of cable
The temperature initial value of structure recycles the cable Analysis of Transient Thermal Field differential equation, obtains the protective metal shell temperature of the cable different moments
Degree；
Thermal resistance thermal capacitance computing module, for the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments
Degree, obtains including the thermal resistance of the external environment different moments of the cable and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance, utilizes the thermal resistance
Thermal capacitance ordered series of numbers obtains the thermal resistance and thermal capacitance of external environment；
Conductor temperature prediction module, each layer structure of cable for thermal resistance and thermal capacitance, current time using external environment
Temperature initial value and the cable Analysis of Transient Thermal Field differential equation, obtain the temperature prediction of the conductor of the cable of subsequent time
Value；
Wherein, the cable Analysis of Transient Thermal Field differential equation is to establish using based on Fourier's heat transfer law and Re Lufa
The prediction of high-tension cable conductor temperature calculates thermal circuit model building, and the high-tension cable conductor temperature prediction calculates thermal circuit model and is
The model obtained using the external laying environment of the comprehensive cable of the cable body Transient Thermal Circuit model obtained based on Re Lufa；
The external thermal resistance thermal capacitance calculation formula is by the way that the Equivalent heat path of the external environment of the cable is considered as port
Network, based on the solution to port parameters within network, what definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtained includes
Oversheath temperature, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, the heat of external environment
The formula of resistance and thermal capacitance.
Optionally, the cable Analysis of Transient Thermal Field differential equation are as follows:
P=[P1 P2 … te/Re]T；
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment,
ReIndicate the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
Optionally, the external thermal resistance thermal capacitance calculation formula are as follows:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval.
Optionally, the thermal resistance thermal capacitance computing module, comprising:
Thermal resistance thermal capacitance computing unit, for the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments
Degree, obtains including the thermal resistance of the external environment different moments of the cable and the initial thermal resistance thermal capacitance ordered series of numbers of thermal capacitance；
Ordered series of numbers screening unit obtains institute for screening using Pauta criterion to the initial thermal resistance thermal capacitance ordered series of numbers
State thermal resistance thermal capacitance ordered series of numbers.
The invention also discloses a kind of cable conductor temperature prediction techniques, comprising:
The history oversheath temperature of cable, the temperature initial value of ambient boundary temperature and each layer structure of cable are obtained, is recycled
The cable Analysis of Transient Thermal Field differential equation obtains the protective metal shell temperature of the cable different moments；
Using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtain including the outer of the cable
The thermal resistance of portion's environment different moments and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance obtain external environment using the thermal resistance thermal capacitance ordered series of numbers
Thermal resistance and thermal capacitance；
It is temporary using the thermal resistance and thermal capacitance of external environment, the temperature initial value of each layer structure of the cable at current time and the cable
The state temperature field differential equation obtains the temperature prediction value of the conductor of the cable of subsequent time；
Wherein, the cable Analysis of Transient Thermal Field differential equation is to establish using based on Fourier's heat transfer law and Re Lufa
The prediction of high-tension cable conductor temperature calculates thermal circuit model building, and the high-tension cable conductor temperature prediction calculates thermal circuit model and is
The model obtained using the external laying environment of the comprehensive cable of the cable body Transient Thermal Circuit model obtained based on Re Lufa；
The external thermal resistance thermal capacitance calculation formula is by the way that the Equivalent heat path of the external environment of the cable is considered as port
Network, based on the solution to port parameters within network, what definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtained includes
Oversheath temperature, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, the heat of external environment
The formula of resistance and thermal capacitance.
Optionally, the cable Analysis of Transient Thermal Field differential equation are as follows:
P=[P1 P2 … te/Re]T；
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment,
ReIndicate the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
Optionally, the external thermal resistance thermal capacitance calculation formula are as follows:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval.
Optionally, the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments, including
The thermal resistance of the external environment different moments of the cable and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance are obtained using the thermal resistance thermal capacitance ordered series of numbers
To the thermal resistance of external environment and the process of thermal capacitance, comprising:
Using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtain including the outer of the cable
The thermal resistance of portion's environment different moments and the initial thermal resistance thermal capacitance ordered series of numbers of thermal capacitance；
The initial thermal resistance thermal capacitance ordered series of numbers is screened using Pauta criterion, obtains the thermal resistance thermal capacitance ordered series of numbers.
The invention also discloses a kind of cable conductor temperature prediction meanss, comprising:
Memory, for storing computer program；
Processor realizes cable conductor temperature prediction technique as the aforementioned for executing the computer program.
In the present invention, cable conductor temperature forecasting system, comprising: sheath temperature computing module, for obtaining going through for cable
The temperature initial value of history oversheath temperature, ambient boundary temperature and each layer structure of cable recycles cable Analysis of Transient Thermal Field differential side
Journey obtains the protective metal shell temperature of cable different moments；Thermal resistance thermal capacitance computing module, it is public for being calculated using external thermal resistance thermal capacitance
The protective metal shell temperature of formula and different moments obtains including the thermal resistance of the external environment different moments of cable and the thermal resistance heat of thermal capacitance
Hold ordered series of numbers and obtains the thermal resistance and thermal capacitance of external environment using thermal resistance thermal capacitance ordered series of numbers；Conductor temperature prediction module, for outside
The temperature initial value and the cable Analysis of Transient Thermal Field differential equation of the thermal resistance and thermal capacitance of portion's environment, each layer structure of the cable at current time,
Obtain the temperature prediction value of the conductor of the cable of subsequent time；Wherein, the cable Analysis of Transient Thermal Field differential equation is using based on Fu
In leaf heat transfer law and Re Lufa establish high-tension cable conductor temperature prediction calculate thermal circuit model building, high-tension cable conductor
It is to utilize the outside based on the obtained cable body Transient Thermal Circuit model composite cable of Re Lufa that temperature prediction, which calculates thermal circuit model,
The model that laying environment obtains；External thermal resistance thermal capacitance calculation formula is by the way that the Equivalent heat path of the external environment of cable is considered as end
Mouthful network, based on the solution to port parameters within network, packet that definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtain
Include oversheath temperature, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, external environment
The formula of thermal resistance and thermal capacitance.
The present invention is based on the historical measurement datas of cable, extrapolate the thermal resistance and thermal capacitance of subsequent time external environment, solve
External environment unknown the problem of leading to not prediction, the temperature initial value of each layer structure of cable based on current time utilizes electricity
The cable Analysis of Transient Thermal Field differential equation extrapolates the cable conductor temperature of subsequent time, realizes the prediction to cable conductor temperature, is
Dynamic increases cable power transmission capacity, improves cable utilization efficiency and power grid summer peak meeting heavy load period or tight to greatest extent
Power scheduling when anxious power supply provides reference frame.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of cable conductor temperature forecasting system structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 2 is a kind of cable the schematic diagram of the section structure disclosed by the embodiments of the present invention；
Fig. 3 is that a kind of high-tension cable conductor temperature prediction disclosed by the embodiments of the present invention calculates thermal circuit model figure；
Fig. 4 is a kind of cable conductor temperature prediction technique flow diagram disclosed by the embodiments of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Shown in Figure 1 the embodiment of the invention discloses a kind of cable conductor temperature forecasting system, which includes:
Sheath temperature computing module 11, history oversheath temperature, ambient boundary temperature and the cable for obtaining cable are each
The temperature initial value of layer structure, recycles the cable Analysis of Transient Thermal Field differential equation, obtains the protective metal shell temperature of cable different moments.
Specifically, according to single-core cable sectional structure chart, for example, 110kV single-core cable sectional structure chart shown in Fig. 2,
And Fourier conducts heat law it is found that by the heat dQ of the infinitesimal of sectional area dA in the unit time, is proportional to perpendicular to section
Rate of temperature change and sectional area dA on direction, specifically there is following relationship:
In formula, λ is the thermal coefficient of sectional area material, and unit Km/W, t are temperature, unit K；Negative sign represents heat
The direction of transfer of amount is that the direction reduced along thermal field gradient carries out.
Specifically, can be that the concentration calculated suitable for hot road is joined by infinitesimal model conversation in the practical application of Re Lufa
Exponential model expands infinitesimal cylindrical wall for cable radius r1To r2Between cylindrical wall (wherein r1<r2), it is applied to cable body
Each layer structure in region, can be obtained cable body Transient Thermal Circuit illustraton of model.Consider Exterior cable laying environment when and cable body
Each layer structural analysis in region is the same, and the heat caused by the cable conductor passes through the absorption and transmission of cable body part, remaining
Part reach cable laying environment.Therefore, it is as shown in Figure 3 to establish high-tension cable conductor temperature prediction calculating thermal circuit model.
Further, thermal circuit model is calculated based on the prediction of high-tension cable conductor temperature, conducted heat to each layer of cable body
Analysis can obtain, cable temperature field expression formula:
Further, cable temperature field expression formula can be arranged are as follows:
Wherein,
It enables:
P=[P1 P2 … te/Re]T；
Finally obtain the cable Analysis of Transient Thermal Field differential equation:
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment,
ReIndicate the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
Specifically, as shown in Fig. 2, cable include conductor layer 1, it is conductor shield 2, insulating layer 3, insulation screen 4, wrapped
Layer 5, air gap layer 6, metal sheath layer 7 and external sheath layer 8, as shown in figure 3, due to conductor shield to each list of insulation screen
Layer small volume, the influence to temperature is small, can be ignored, so by conductor shield to insulation screen be considered as one it is whole
Body layer is divided into 6 layers, and n takes 6, successively include conductor layer 21, insulating layer and interior external shielding layer 22, wrapping layer 23, air gap layer 24,
Metal sheath layer 25 and external sheath layer 26 additionally include external environment 27.
Wherein, in P generation, refers to the heat (loss including conductor losses and each layer insulation system) of each layer of generation, from thermoelectricity etc.
From the point of view of effect, P is equivalent to current source, is exactly heating flow source in thermal circuits.
It is understood that by the manufacture craft of cable it is found that cable can be equivalent to the cylindrical wall knot an of multilayer nest
Structure, in conjunction with heat transfer principle, the calculation formula of each layer structure thermal resistance of the cable of unit length and thermal capacitance can be by thermal resistance calculation formula
It is obtained with thermal capacitance formula proving, so in conjunction with thermal resistance calculation formula, thermal capacitance calculation formula and cable Analysis of Transient Thermal Field differential
Equation can solve the thermal resistance thermal physical property parameter related to thermal capacitance etc. of each layer structure of cable；Wherein,
Thermal resistance calculation formula are as follows:
Thermal capacitance calculation formula are as follows: C=c π (r2 2-r1 2)；
In formula, R indicates thermal resistance, and C indicates thermal capacitance, and λ indicates the thermal coefficient of cable layers of material, unit W/Km, c table
Show that the unit volume specific heat capacity of cable layers of material, unit are J/ (m3/K)。
Further, by by historical measurement data, that is, cable oversheath temperature of known different moments, environment side
The temperature initial value of boundary's temperature and each layer structure of cable substitutes into the cable Analysis of Transient Thermal Field differential equation and combines thermal resistance calculation formula
It, can be by the way that the temperature of metal sheath layer, i.e. protective metal shell temperature be calculated in real time with thermal capacitance calculation formula.
Specifically, historical measurement data include the oversheath temperature of the cable of multiple groups different time, ambient boundary temperature and
Therefore the temperature initial value of each layer structure of cable corresponding can obtain the protective metal shell temperature of multiple and different times, wherein be
Realize the derivation and prediction to temperature, the data of different time are the data of continuous spacer unit time interval, rather than are jumped
Jump property, for example, using continuous acquisition 60 times in 1 hour at interval of the oversheath temperature of 1 minute cable, ambient boundary
The historical measurement data of the temperature initial value of temperature and each layer structure of cable.
It is understood that calorific value has direct relation with cable institute's load power since cable internal structure is fixed,
Therefore, cable temperature uncertainty is mainly derived from influence of the external environment to cable temperature, wherein external sheath layer it is outermost one
Layer, the temperature of oversheath are particularly subject to the influence of external environment, and metal sheath layer is as close to one layer of external sheath layer its temperature
It is directly influenced by external sheath layer, while having reflection cable conductor temperature and external rings as one layer inside cable again
Relationship between the interaction of border temperature, therefore, it is necessary to solve the temperature of metal sheath layer, further to analyze.
Thermal resistance thermal capacitance computing module 12, for the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments
Degree obtains including the thermal resistance of the external environment different moments of cable and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance, using thermal resistance thermal capacitance ordered series of numbers,
Obtain the thermal resistance and thermal capacitance of external environment.
Specifically, the Equivalent heat path of Exterior cable environment can be can be considered a port network, by port network
The mathematic(al) manipulation of input variable and output variable can realize the solution to port parameters within network.In conjunction with the definition of thermal capacitance thermal resistance
Following formula can be obtained with heat conservation law,
Arrangement can obtain,
Further arranging abbreviation can obtain, external thermal resistance thermal capacitance calculation formula:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval, PsIndicate protective metal shell
The heat flow that layer is transmitted to external sheath layer.
It should be noted that in external thermal resistance thermal capacitance calculation formula time interval be not easy it is too small, it is too small when will lead to two
Between be spaced in temperature change is too small that external thermal resistance thermal capacitance calculation formula denominator is caused to be that zero can not calculate.
Specifically, the thermal resistance thermal capacitance computing unit in thermal resistance thermal capacitance computing module 12, is calculated public based on external thermal resistance thermal capacitance
Formula, by the protective metal shell temperature of different moments, can solve the external environment at corresponding multiple and different moment thermal resistance and
Thermal capacitance can further be derived according to the history thermal resistance and thermal capacitance of multiple groups external environment including under different time intervals
The thermal resistance of external environment and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance, for example, it is small to solve one by the protective metal shell temperature of different moments
When interior 60 groups of external environments at interval of 1 minute history thermal resistance and thermal capacitance, can continue to derive future one on this basis
At interval of the thermal resistance and thermal capacitance of 1 minute 60 groups of external environment in hour.
Further, the ordered series of numbers screening unit in thermal resistance thermal capacitance computing module 12, to ensure the heat in thermal resistance thermal capacitance ordered series of numbers
The accuracy of resistance and thermal capacitance passes through Pauta criterion (i.e. 3 σ principles, in the case that experimental data meets normal distribution, if certain
The degree that data deviate overall data average value is more than 3 σ, i.e., 3 times of data standard is poor, then it is believed that such data is abnormal number
According to not participating in subsequent calculating process) reject abnormal data in calculated result ordered series of numbers, and that ordered series of numbers seeks is average to treated
It is worth to get Exterior cable environment equivalent thermal resistance and thermal capacitance is arrived.
Conductor temperature prediction module 13, each layer knot of cable for thermal resistance and thermal capacitance, current time using external environment
The temperature initial value and the cable Analysis of Transient Thermal Field differential equation of structure, obtain the temperature prediction value of the conductor of the cable of subsequent time.
Specifically, the analysis showed that, it is believed that environment thermal physical property parameter, that is, external environment thermal resistance and thermal capacitance have short
The characteristic remained unchanged in time, so the thermal resistance and thermal capacitance using external environment obtained above can be used as subsequent time
The thermal resistance and thermal capacitance of external environment, by each layer structure of the cable of the thermal resistance of the external environment of subsequent time and thermal capacitance, current time
Temperature initial value and each layer structure of cable solved according to thermal resistance, thermal capacitance calculation formula thermal resistance and the associated hots object such as thermal capacitance
Property parameter, substitute into the cable Analysis of Transient Thermal Field differential equation in, the temperature of the conductor in corresponding subsequent time cable can be solved
Degree, i.e. the temperature prediction value of the conductor of cable, realize the temperature prediction of cable conductor.
Wherein, the temperature initial value of each layer structure of the cable at current time can measure each layer of current cable by measuring device
The temperature of structure obtains.
As it can be seen that historical measurement data of the embodiment of the present invention based on cable, extrapolates the thermal resistance of subsequent time external environment
And thermal capacitance, it solves the problems, such as that external environment is unknown and leads to not prediction, realize the cable conductor temperature in subsequent time period
Prediction, increases cable power transmission capacity for dynamic, when improving cable utilization efficiency and power grid summer peak meeting heavy load to greatest extent
Power scheduling when phase or emergency service provides reference frame.
Correspondingly, the embodiment of the invention also discloses a kind of cable conductor temperature prediction technique, shown in Figure 4, the party
Method includes:
S11: obtaining the temperature initial value of each layer structure of history oversheath temperature, ambient boundary temperature and cable of cable, then
Using the cable Analysis of Transient Thermal Field differential equation, the protective metal shell temperature of cable different moments is obtained；
S12: it using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtains including the outer of cable
The thermal resistance of portion's environment different moments and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance obtain the thermal resistance of external environment using thermal resistance thermal capacitance ordered series of numbers
And thermal capacitance；
S13: temporary using the thermal resistance and thermal capacitance of external environment, the temperature initial value of each layer structure of the cable at current time and cable
The state temperature field differential equation obtains the temperature prediction value of the conductor of the cable of subsequent time；
Wherein, the cable Analysis of Transient Thermal Field differential equation is to utilize the high pressure established based on Fourier's heat transfer law and Re Lufa
Cable conductor temperature prediction calculating thermal circuit model building, it is to utilize to be based on that the prediction of high-tension cable conductor temperature, which calculates thermal circuit model,
The model that the external laying environment for the cable body Transient Thermal Circuit model composite cable that Re Lufa is obtained obtains；
External thermal resistance thermal capacitance calculation formula is to be based on by the way that the Equivalent heat path of the external environment of cable is considered as port network
Solution to port parameters within network, what definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtained includes oversheath temperature
Degree, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, the thermal resistance of external environment and thermal capacitance
Formula.
Wherein, the above-mentioned cable Analysis of Transient Thermal Field differential equation are as follows:
P=[P1 P2 … te/Re]T；
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment,
ReIndicate the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
Said external thermal resistance thermal capacitance calculation formula are as follows:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval.
Specifically, above-mentioned S12 utilizes the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, wrapped
The thermal resistance thermal capacitance ordered series of numbers of the thermal resistance and thermal capacitance that include the external environment different moments of cable obtains outside using thermal resistance thermal capacitance ordered series of numbers
The thermal resistance of environment and the process of thermal capacitance, may include S121 and S122；Wherein,
S121: it using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtains including cable
The thermal resistance of external environment different moments and the initial thermal resistance thermal capacitance ordered series of numbers of thermal capacitance；
S122: initial thermal resistance thermal capacitance ordered series of numbers is screened using Pauta criterion, obtains thermal resistance thermal capacitance ordered series of numbers.
In addition, the embodiment of the invention also discloses a kind of cable conductor temperature prediction meanss, comprising:
Memory, for storing computer program；
Processor realizes cable conductor temperature prediction technique as the aforementioned for executing computer program.
In addition, the embodiment of the invention also discloses a kind of computer readable storage medium, on computer readable storage medium
It is stored with computer program, cable conductor temperature prediction technique as the aforementioned is realized when computer program is executed by processor.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
Technology contents provided by the present invention are described in detail above, specific case used herein is to this hair
Bright principle and embodiment is expounded, method of the invention that the above embodiments are only used to help understand and its
Core concept；At the same time, for those skilled in the art, according to the thought of the present invention, in specific embodiment and application
There will be changes in range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of cable conductor temperature forecasting system characterized by comprising
Sheath temperature computing module, for obtaining each layer structure of history oversheath temperature, ambient boundary temperature and cable of cable
Temperature initial value, recycle the cable Analysis of Transient Thermal Field differential equation, obtain the protective metal shell temperature of the cable different moments；
Thermal resistance thermal capacitance computing module is obtained for the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments
To the thermal resistance for the external environment different moments for including the cable and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance, the thermal resistance thermal capacitance number is utilized
Column, obtain the thermal resistance and thermal capacitance of external environment；
Conductor temperature prediction module, the temperature of each layer structure of cable for thermal resistance and thermal capacitance, current time using external environment
Initial value and the cable Analysis of Transient Thermal Field differential equation are spent, the temperature prediction value of the conductor of the cable of subsequent time is obtained；
Wherein, the cable Analysis of Transient Thermal Field differential equation is to utilize the high pressure established based on Fourier's heat transfer law and Re Lufa
Cable conductor temperature prediction calculates thermal circuit model building, and it is to utilize that the high-tension cable conductor temperature prediction, which calculates thermal circuit model,
The model that external laying environment based on the obtained comprehensive cable of cable body Transient Thermal Circuit model of Re Lufa obtains；
The external thermal resistance thermal capacitance calculation formula be by the way that the Equivalent heat path of the external environment of the cable is considered as port network,
Based on the solution to port parameters within network, what definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtained includes oversheath
Temperature, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, the thermal resistance of external environment and heat
The formula of appearance.
2. cable conductor temperature forecasting system according to claim 1, which is characterized in that the cable Analysis of Transient Thermal Field is micro-
Divide equation are as follows:
P=[P1 P2 … te/Re]T；
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment, ReTable
Show the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
3. cable conductor temperature forecasting system according to claim 1, which is characterized in that the external thermal resistance thermal capacitance calculates
Formula are as follows:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval.
4. cable conductor temperature forecasting system according to claim 1, which is characterized in that the thermal resistance thermal capacitance calculates mould
Block, comprising:
Thermal resistance thermal capacitance computing unit is obtained for the protective metal shell temperature using external thermal resistance thermal capacitance calculation formula and different moments
To the thermal resistance for the external environment different moments for including the cable and the initial thermal resistance thermal capacitance ordered series of numbers of thermal capacitance；
Ordered series of numbers screening unit obtains the heat for screening using Pauta criterion to the initial thermal resistance thermal capacitance ordered series of numbers
Thermal resistance holds ordered series of numbers.
5. a kind of cable conductor temperature prediction technique characterized by comprising
The history oversheath temperature of cable, the temperature initial value of ambient boundary temperature and each layer structure of cable are obtained, cable is recycled
The Analysis of Transient Thermal Field differential equation obtains the protective metal shell temperature of the cable different moments；
Using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtain include the cable external rings
The thermal resistance of border different moments and the thermal resistance thermal capacitance ordered series of numbers of thermal capacitance obtain the thermal resistance of external environment using the thermal resistance thermal capacitance ordered series of numbers
And thermal capacitance；
Utilize the thermal resistance and thermal capacitance of external environment, the temperature initial value of each layer structure of the cable at current time and the cable transient state temperature
The field differential equation is spent, the temperature prediction value of the conductor of the cable of subsequent time is obtained；
Wherein, the cable Analysis of Transient Thermal Field differential equation is to utilize the high pressure established based on Fourier's heat transfer law and Re Lufa
Cable conductor temperature prediction calculates thermal circuit model building, and it is to utilize that the high-tension cable conductor temperature prediction, which calculates thermal circuit model,
The model that external laying environment based on the obtained comprehensive cable of cable body Transient Thermal Circuit model of Re Lufa obtains；
The external thermal resistance thermal capacitance calculation formula be by the way that the Equivalent heat path of the external environment of the cable is considered as port network,
Based on the solution to port parameters within network, what definition and heat conservation law in conjunction with thermal capacitance thermal resistance obtained includes oversheath
Temperature, protective metal shell temperature, ambient temperature, the thermal resistance of oversheath, the thermal resistance of protective metal shell, the thermal resistance of external environment and heat
The formula of appearance.
6. cable conductor temperature prediction technique according to claim 1, which is characterized in that the cable Analysis of Transient Thermal Field is micro-
Divide equation are as follows:
P=[P1 P2 … te/Re]T；
In formula, CnIndicate the thermal capacitance of cable n-th layer, RnIndicate the thermal resistance of cable n-th layer, CeIndicate the thermal capacitance of external environment, ReTable
Show the thermal resistance of external environment, P indicates quantity of heat production, tnIndicate the temperature of cable n-th layer, teIndicate the temperature of external environment.
7. cable conductor temperature prediction technique according to claim 1, which is characterized in that the external thermal resistance thermal capacitance calculates
Formula are as follows:
In formula, t5Indicate protective metal shell temperature, t6Indicate oversheath temperature, h indicates time interval.
8. cable conductor temperature prediction technique according to claim 1, which is characterized in that described to utilize external thermal resistance thermal capacitance
The protective metal shell temperature of calculation formula and different moments, obtain include the external environment different moments of the cable thermal resistance and heat
The thermal resistance thermal capacitance ordered series of numbers of appearance obtains the thermal resistance of external environment and the process of thermal capacitance using the thermal resistance thermal capacitance ordered series of numbers, comprising:
Using the protective metal shell temperature of external thermal resistance thermal capacitance calculation formula and different moments, obtain include the cable external rings
The thermal resistance of border different moments and the initial thermal resistance thermal capacitance ordered series of numbers of thermal capacitance；
The initial thermal resistance thermal capacitance ordered series of numbers is screened using Pauta criterion, obtains the thermal resistance thermal capacitance ordered series of numbers.
9. a kind of cable conductor temperature prediction meanss characterized by comprising
Memory, for storing computer program；
Processor, for executing the computer program to realize such as the described in any item cable conductor temperatures of claim 5 to 8
Prediction technique.
10. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program is realized when the computer program is executed by processor as the described in any item cable conductor temperatures of claim 5 to 8 are pre-
Survey method.
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| CN113190972A (en) * | 2021-04-08 | 2021-07-30 | 广东电网有限责任公司广州供电局 | Conductor temperature calculation method of cable joint and body based on micro-elements |
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